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Its no longer a rolling 20 year rule.The cut off year is 1987 and older that are exempt. Anything newer from 1988 and up needs an e-test. Just did my 88 535IS last week and it passed.Whew! Magnaflow cats are pretty low cost but make sure you get a new O2 sensor as well to better your chances of passing an e-test.Buy new for sure!